The patch titled
vfs: fix lock inversion in drop_pagecache_sb()
has been added to the -mm tree. Its filename is
vfs-fix-lock-inversion-in-drop_pagecache_sb.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: vfs: fix lock inversion in drop_pagecache_sb()
From: Jan Kara <jack@xxxxxxx>
Fix longstanding lock inversion in drop_pagecache_sb by dropping inode_lock
before calling __invalidate_mapping_pages(). We just have to make sure inode
won't go away from under us by keeping reference to it and putting the
reference only after we have safely resumed the scan of the inode list. A bit
tricky but not too bad...
Signed-off-by: Jan Kara <jack@xxxxxxx>
Cc: Fengguang Wu <wfg@xxxxxxxxxxxxxxxx>
Cc: David Chinner <dgc@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/drop_caches.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN fs/drop_caches.c~vfs-fix-lock-inversion-in-drop_pagecache_sb fs/drop_caches.c
--- a/fs/drop_caches.c~vfs-fix-lock-inversion-in-drop_pagecache_sb
+++ a/fs/drop_caches.c
@@ -14,15 +14,21 @@ int sysctl_drop_caches;
static void drop_pagecache_sb(struct super_block *sb)
{
- struct inode *inode;
+ struct inode *inode, *toput_inode = NULL;
spin_lock(&inode_lock);
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
if (inode->i_state & (I_FREEING|I_WILL_FREE))
continue;
+ __iget(inode);
+ spin_unlock(&inode_lock);
__invalidate_mapping_pages(inode->i_mapping, 0, -1, true);
+ iput(toput_inode);
+ toput_inode = inode;
+ spin_lock(&inode_lock);
}
spin_unlock(&inode_lock);
+ iput(toput_inode);
}
void drop_pagecache(void)
_
Patches currently in -mm which might be from jack@xxxxxxx are
origin.patch
git-udf.patch
git-ocfs2.patch
quota-do-not-allow-setting-of-quota-limits-to-too-high-values.patch
quota-remove-superfluous-dquot_off-in-fs-namespacec.patch
quota-various-style-cleanups.patch
quota-various-style-cleanups-checkpatch-fixes.patch
quota-quota-core-changes-for-quotaon-on-remount.patch
quota-quota-core-changes-for-quotaon-on-remount-quota-ext3-make-ext3-handle-quotaon-on-remount.patch
quota-quota-core-changes-for-quotaon-on-remount-quota-ext3-make-ext3-handle-quotaon-on-remount-checkpatch-fixes.patch
quota-quota-core-changes-for-quotaon-on-remount-quota-ext4-make-ext4-handle-quotaon-on-remount.patch
quota-quota-core-changes-for-quotaon-on-remount-quota-ext4-make-ext4-handle-quotaon-on-remount-checkpatch-fixes.patch
quota-quota-core-changes-for-quotaon-on-remount-quota-reiserfs-make-reiserfs-handle-quotaon-on-remount.patch
ext3-fdatasync-should-skip-metadata-writeout-when-overwriting.patch
quota-le_add_cpu-conversion.patch
vfs-fix-lock-inversion-in-drop_pagecache_sb.patch
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